Håkan K.
Consultant
Experience
Jan 2024 - Present
1 year 10 monthsLadenburg, Germany
Consultant
BIPLA eV
- Planning photovoltaic systems for a citizens' initiative
- Designing billing systems
Feb 2022 - Oct 2023
1 year 9 monthsDarmstadt, Germany
Consultant
Telekom AG
- Migrating a distributed application to new hardware (Linux, Solaris, AIX)
- Building OpenSolaris tools on Linux
- Using Universal Package Manager and EPM for cross-platform package deployment
- Shell scripting
- Using GitLab
Jan 2022 - Apr 2022
4 monthsKönigsbach-Stein, Germany
Consultant
Stöhr GmbH
- Building a web application for billing charging sessions in an electric car charging park
- Managing charging stations, users, and RFID cards
- Implemented with Python/Django on Raspberry Pi
Sep 2021 - Dec 2021
4 monthsWeiterstadt, Germany
Consultant
Sitikom GmbH
- Testing dial-in solutions in the carrier sector
- Test automation with RobotFramework and ScaPy
- Using Git, GitLab, Debian, and Jira in a Scrum environment
May 2021 - Jul 2021
3 monthsBremen, Germany
Consultant
Univention GmbH
- Porting from Python 2 to Python 3
- Using Git, GitLab, and Debian in the Scrum process
Jul 2019 - Feb 2020
8 monthsVienna, Austria
Consultant
Hei GmbH
- Developed a gateway for the TALQ smart city protocol
- Used a Digi embedded computer for the WirePas mesh network protocol and REST-based TALQ
- Programming in Python 3 with Twisted
Jan 2019 - Jun 2019
6 monthsStuttgart, Germany
Consultant
Mackevision GmbH
- Created a REST interface to forward data via socket to an Unreal server
- Planned a WebSocket interface
- Programmed in Python
- Used Git with Bitbucket and Jira
May 2018 - Oct 2018
6 monthsDüsseldorf, Germany
Consultant
Metro AG
- Built a QR code reader app using Python Tkinter
- Used an existing JSON-based REST API for the dcTrack data center management system
- Python packaging and usage analysis of QR codes
Jan 2018 - Mar 2018
3 monthsDüsseldorf, Germany
Consultant
Metro AG
- API programming and design with Django REST Framework
- Developed an API to maintain nameserver data
- Evaluated Flask, Twisted and SQLAlchemy as alternatives
Dec 2016 - Apr 2017
5 monthsFrankfurt, Germany
Consultant
ITZ Bund
- Connected mobile laptops with encrypted file systems
- Installed VS-NfD systems with VPN connections
- Set up Secunet SINA workstations and SINA smart cards
- Developed small Python and Bash scripts
Jan 2013 - Mar 2016
3 years 3 monthsWalldorf, Germany
Consultant
Chargepartner GmbH
- Further development in the field of e-mobility in the eGap research project
- Co-development of a multi-tenant e-mobility platform as a business-as-a-service
- Connecting charging stations via LyconSys router and OpenVPN
- Implementation of REST-based web services and use of external geo services
- Technologies: Python, Bash, MySQL, PHP
- Programming charging station controllers on embedded Linux
- Use of Crossbar and microservices for real-time data display
- Phone-based activation of charging sessions via SIP-Gate and Asterisk server
Sep 2012 - Dec 2012
4 monthsStuttgart, Germany
Consultant
Porse AG
- Email and domain management with Postfix and Bind
- Scripting in Perl, Python, and Bash
- Use of Git as a repository
Feb 2010 - Jul 2012
2 years 6 monthsSchriesheim, Germany
Consultant
Linuxpartner GmbH
- Participation in the FutureFleet e-mobility research project
- Development of charging management software for electric cars in Python
- Web programming and data exchange with PHP and MySQL
- Architecture design with REST APIs and XML/XSD messages
- Development of later JSON interfaces
Jul 2009 - Jan 2010
7 monthsFrankfurt, Germany
Consultant
LyconSys GmbH
- Software development on LyconSys router platform (embedded Linux)
- Shell scripting, software packaging, and web programming
May 2009 - Jun 2009
2 monthsGermany
Consultant
Telekom/IBM
- Development in C on AIX
- Adaptation of existing RADIUS tools to IPv6
Jan 2009 - Present
16 years 10 monthsGermany
Consultant
Sports Club (unnamed)
- Created a member management system with mailing list management
- Developed using PHP, MySQL, and Perl
- Extended it into a multi-tenant system
Jan 2008 - Present
17 years 10 monthsSweden
Consultant
unnamed
- Set up an Asterisk-based call center
May 2007 - Apr 2009
2 yearsGermany
Consultant
Telekom/IBM
- Tested customer-specific DHCP and RADIUS software on the AIX platform
- Performed scripting and Perl programming for log analysis
Mar 2007 - Present
18 years 8 monthsGermany
Consultant
unnamed
- Set up eGroupWare with an LDAP contact database for VoIP phones (Snom)
Jan 2007 - Feb 2007
2 monthsGermany
Consultant
unnamed
- Created a call center agent application using LAMP
- Developed Perl CGI scripts for Excel export and import
Dec 2006 - Present
18 years 11 monthsGermany
Consultant
unnamed
- Set up a server rack with a switch, Astaro firewall, UPS, and a Linux-based Samba/Intranet server
Nov 2006 - Present
19 yearsGermany
Consultant
unnamed
- Installed and commissioned an Astaro firewall with a VPN connection
Oct 2006 - Present
19 years 1 monthGermany
Consultant
unnamed
- Set up a Zarafa Outlook server on Linux/MySQL
Jan 2006 - Dec 2006
1 yearConsultant
unnamed
- Developed several telephone systems based on Asterisk worldwide
Jul 2004 - Jul 2011
7 years 1 monthConsultant
unnamed
- Implemented VoIP solutions using Cisco and Asterisk VoIP servers, ISDN PRI
- Integrated IP telephone systems and installed VoIP phones
Mar 2004 - Present
21 years 8 monthsGermany
Consultant
unnamed
- Preparation and delivery of a technician training in s390 Linux, zSeries
Jan 2004 - Dec 2004
1 yearGermany
Consultant
unnamed
- Definition and implementation of firewall, VPN, and email concepts for the public sector and SMEs
- Installation of mail systems with spam control (SPF, Greylisting)
Jan 2003 - Present
22 years 10 monthsGermany
Consultant
Broker Group
- Webmaster tasks and creation of an automated billing system for web transactions
Jan 2003 - Dec 2004
2 yearsGermany
Consultant
unnamed
- Setup of various web hosting environments on Linux/Solaris platforms
Jan 2002 - Present
23 years 10 monthsFrankfurt, Germany
Consultant
Reuters AG
- Modification of an application: license management and additional calculation functions
- Platform: C/C++ on Solaris
Jan 2002 - Present
23 years 10 monthsGermany
Consultant
Unnamed
- Analysis and design of security for a trading company, including firewall consulting and installations on Linux/Solaris and Cisco
Jan 2000 - Dec 2002
3 yearsGermany
Consultant
Telekurs AG
- Development of an interface for importing securities master data into the SAP Treasury system at Telekurs
- Technologies: WebMethods, Perl, XML/DTD
Jan 1999 - Dec 2000
2 yearsFrankfurt, Germany
Consultant
Commerzbank AG
- Development of a disaster recovery tool to implement a mirrored backup
- Use of Perl and Sybase on Sun E10k, Brocade SAN, EMC Symmetrix
Jan 1997 - Dec 1999
3 yearsGermany
Consultant
SAP/Reuters
- Interface programming for SAP Treasury for real-time import of Reuters market data
- Technologies: Solaris, C++, Triarch SSL
Languages
German
NativeSwedish
NativeEnglish
AdvancedSpanish
ElementaryFrench
ElementaryEducation
Chalmers Tekniska Universitet
Computer Science · Gothenburg, Sweden
Chalmers Tekniska Universitet
Physics · Gothenburg, Sweden
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